lavfi: add sobel, prewitt, roberts filters

Multimedia / FFmpeg - Danil Iashchenko [gmail.com] - 2 July 2018 23:11 EDT

Add opencl version of sobel, prewitt, roberts filters.

581bafa83b lavfi: add sobel, prewitt, roberts filters
configure | 3 +
libavfilter/Makefile | 8 +-
libavfilter/allfilters.c | 3 +
libavfilter/opencl/convolution.cl | 82 +++++++++++++
libavfilter/vf_convolution_opencl.c | 233 +++++++++++++++++++++++++++++-------
5 files changed, 283 insertions(+), 46 deletions(-)

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